title: Littrow angle based autocollimation method for precision online monitoring three-dimensional angular drifts of chirped-pulse compression-gratings.
abstract: A simple optical method for online precisely monitoring three-dimensional (3D) angular drifts of chirped-pulse compression-gratings in chirped-pulse amplification (CPA) lasers is proposed. Monitoring objects include all dimensional angular drifts of a grating, especially the grating groove in-plane-rotation. Monitoring contents contain direction and amount. And monitoring results are obtained by detecting the direction and the amount of 2D relative offsets of three focal spots formed by a ternary monitoring beam line. The theoretical model of the proposed method is set up using a matrix ray-tracing method, and a simplified monitoring equation is concluded based on numerical simulations. And the validity of this method is verified by a simple demonstration experiment. Besides, monitoring error and reliability discussion of the method are presented, as well.
authors.affiliation: Shanghai Institute of Laser and Plasma, China Academy of Engineering Physics, Shanghai 201800, China. zzyylee@gmail.com
authors.forename: Zhaoyang
authors.initials: Z
authors.lastname: Li
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.forename: Guang
authors.initials: G
authors.lastname: Xu
authors.forename: Dawei
authors.initials: D
authors.lastname: Li
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.forename: Yaping
authors.initials: Y
authors.lastname: Dai